Reporting from Washingtonâ€” In a clear sign of Pakistan's deepening mistrust of the United States, Islamabad has told the Obama administration to reduce the number of U.S. troops in the country and has moved to close three military intelligence liaison centers, setting back U.S. efforts to eliminate insurgent sanctuaries in largely lawless areas bordering Afghanistan, U.S. officials said.

The liaison centers, also known as "Intelligence Fusion cells," in Quetta and Peshawar are the main conduits for the U.S. to share satellite imagery, target data and other intelligence with Pakistani ground forces conducting operations against militants, including Taliban fighters who slip into Afghanistan to attack U.S. and allied forces.

U.S. special operations units have relied on the three facilities, two in Peshawar and one in Quetta, to help coordinate operations on both sides of the border, senior U.S. officials said. The U.S. units are now being withdrawn from all three sites, the officials said, and the centers are being shut down.

It wasn't immediately clear whether the steps are permanent. Adm. Mike Mullen, the chairman of the Joint Chiefs, flew Thursday to Pakistan for a hastily arranged meeting with Gen. Ashfaq Kayani, the head of the Pakistani army. A Pentagon official said the two will probably discuss Pakistan's demands for a smaller U.S. military presence.

The closures, which have not been publicly announced, remove U.S. advisors from the front lines of the war against militant groups in Pakistan. U.S. Army Gen. David Petraeus spearheaded the effort to increase the U.S. presence in the border areas two years ago out of frustration with Pakistan's failure to control the militants.

The collapse of the effort will probably hinder the Obama administration's efforts to gradually push Pakistan toward conducting ground operations against insurgent strongholds in North Waziristan and elsewhere, U.S. officials said.

The Pakistani decision has not affected the CIA's ability to launch missiles from drone aircraft in northwest Pakistan. Those flights, which the CIA has never publicly acknowledged, receive assistance from Pakistan through intelligence channels separate from the fusion centers, current and former officials said.

The move to close the three facilities, plus a written demand to the Pentagon on Wednesday to reduce the approximately 200 U.S. military personnel in the country, follows mounting anger in Pakistan over a series of incidents.

In January, Raymond Davis, a CIA contractor, shot dead two men in Lahore who he said were attempting to rob him. He was arrested on charges of murder but was released and left the country in mid-March, prompting violent protests in several cities.

Soon after, Pakistan ordered several dozen U.S. special operations trainers to leave the country in what U.S. officials believe was retaliation for the Davis case, according to a senior U.S. military officer.

Then, on May 2, five U.S. helicopters secretly entered Pakistani airspace and a team of U.S. Navy SEALs killed Osama bin Laden and four others at a compound in Abbottabad, a military garrison city near the capital, Islamabad. The raid deeply embarrassed Pakistan's military and inflamed anti-U.S. sentiment across the country.

Javed Hussain, a retired Pakistani brigadier, blamed the decision to close the three intelligence centers on the mistrust that has plagued U.S.-Pakistani relations in recent months. Washington's decision to carry out the raid against Bin Laden without informing Pakistan's security establishment brought that mistrust to a new low, he said.

"There is lot of discontent within Pakistan's armed forces with regard to the fact they've done so much in the war on terror, and yet they are not trusted," Hussain said. "Particularly after the Abbottabad raid â€¦ the image of the armed forces in the eyes of the people has gone down. And they hold the U.S. responsible."

The two intelligence centers in Peshawar were set up in 2009, one with the Pakistani army's 11th Corps and the other with the paramilitary Frontier Corps, which are both headquartered in the city, capital of the troubled Khyber-Pakhtunkhwa province.

The third fusion cell was opened last year at the Pakistani army's 12th Corps headquarters in Quetta, a city long used by Taliban fighters to mount attacks in Afghanistan's southern provinces. U.S. troops have staffed the Quetta facility only intermittently, U.S. officials said.

The closures have effectively stopped the U.S. training of the Frontier Corps, a force that American officials had hoped could help halt infiltration of Taliban and other militants into Afghanistan, a senior U.S. military officer said.

The Frontier Corps' facility in Peshawar, staffed by a handful of U.S. special operations personnel, was located at Bala Hissar, an old fort, according to a classified U.S. Embassy cable from 2009 that was recently made public by WikiLeaks.

The cable, which was first disclosed by Pakistan's Dawn newspaper, hinted at U.S. hopes that special operations teams would be allowed to join the paramilitary units and the Special Services Group, a Pakistani army commando unit, in operations against militants.

"We have created Intelligence Fusion cells with embedded U.S. Special Forces with both the SSG and Frontier Corps" at Bala Hissar, Peshawar, the 2009 cable says. "But we have not been given Pakistani military permission to accompany the Pakistani forces on deployments as yet. Through these embeds, we are assisting the Pakistanis [to] collect and coordinate existing intelligence assets."

Another U.S. Embassy cable said that a "U.S. Special Operations Command Force" was providing the Frontier Corps with "imagery, target packages and operational planning" in a campaign against Taliban insurgents in Lower Dir, an area of northwest Pakistan considered an insurgent stronghold.

In September 2009, then U.S. ambassador, Anne W. Patterson, wrote in another classified message that the fusion cells provided "enhanced capacity to share real-time intelligence with units engaged in counter-insurgency operations" and were "a significant step forward for the Pakistan military."

The intelligence fusion cell in Quetta was not nearly as active as the facilities in Peshawar, current and former U.S. officials said. Pakistan has long resisted pressure to intensify operations against Taliban militants in Quetta. The city, capital of Baluchistan, is outside the tribal area, which explains Pakistan's reluctance to permit a permanent U.S. military presence, a U.S. official said.

Despite the ongoing tensions, Pakistani authorities have agreed to allow a CIA team to inspect the compound where Bin Laden was killed, according to a U.S. official. The Pakistanis have signaled they will allow U.S. intelligence analysts to examine documents and other material that Pakistani authorities found at the site.

A U.S. official briefed on intelligence matters said the reams of documents and electronic data that the SEALs seized at the compound have sparked "dozens" of intelligence investigations and have produced new insights into schisms among Al Qaeda leaders.